A Chimera cat. It's 2 distinct cats in one. I have one, she's tabi and black with green eyes.

Maine Coon vs Norwegian Forest Cat

next time the animal shelter notes that the big, long-haired cat you're interested in is "part Maine Coon", chances are it's not, it's just a big, fat long-haired street cat (but adopt it anyhow! Ask yourself if it looks like THIS guy ?